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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <proc/thread.h>
  30. #include <proc/task.h>
  31. #include <mm/as.h>
  32. #include <mm/slab.h>
  33.  
  34. #include <synch/spinlock.h>
  35. #include <arch.h>
  36. #include <panic.h>
  37. #include <adt/list.h>
  38. #include <ipc/ipc.h>
  39. #include <memstr.h>
  40.  
  41. SPINLOCK_INITIALIZE(tasks_lock);
  42. LIST_INITIALIZE(tasks_head);
  43.  
  44. /** Initialize tasks
  45.  *
  46.  * Initialize kernel tasks support.
  47.  *
  48.  */
  49. void task_init(void)
  50. {
  51.     TASK = NULL;
  52. }
  53.  
  54.  
  55. /** Create new task
  56.  *
  57.  * Create new task with no threads.
  58.  *
  59.  * @param as Task's address space.
  60.  *
  61.  * @return New task's structure on success, NULL on failure.
  62.  *
  63.  */
  64. task_t *task_create(as_t *as)
  65. {
  66.     ipl_t ipl;
  67.     task_t *ta;
  68.    
  69.     ta = (task_t *) malloc(sizeof(task_t), 0);
  70.  
  71.     spinlock_initialize(&ta->lock, "task_ta_lock");
  72.     list_initialize(&ta->th_head);
  73.     list_initialize(&ta->tasks_link);
  74.     ta->as = as;
  75.  
  76.     ipc_answerbox_init(&ta->answerbox);
  77.     memsetb((__address)&ta->phones, sizeof(ta->phones[0])*IPC_MAX_PHONES, 0);
  78.     if (ipc_central_box)
  79.         ipc_phone_init(&ta->phones[0], ipc_central_box);
  80.    
  81.     ipl = interrupts_disable();
  82.     spinlock_lock(&tasks_lock);
  83.     list_append(&ta->tasks_link, &tasks_head);
  84.     spinlock_unlock(&tasks_lock);
  85.     interrupts_restore(ipl);
  86.  
  87.     return ta;
  88. }
  89.  
  90.